Which action is NOT possible with CSV imports?

CSV imports in NetSuite are powerful tools for bulk data handling, allowing users to perform various actions with their data sets. The ability to update fields allows users to modify existing records without going into each individual record, streamlining the process of managing data within the system. Creating duplicate records can happen during CSV import unless specific checks are enforced to avoid this; however, this might not always be the desired action and is generally discouraged to maintain data integrity.

Changing sublists is also a capability of CSV imports, as they allow for importing related information that is attached to main records, facilitating comprehensive data updates.

On the other hand, deleting records is not a functionality provided by CSV imports in NetSuite. While users may wish to remove records, this action must be carried out separately, ensuring that data management is handled with care to prevent unintentional data loss or integrity issues. Therefore, the assertion that deleting records is an action that is not possible with CSV imports is accurate.